Use apt-get through http proxy

This issue happened when one day, my lovely company decided that they want to implement a proxy server, and without me realizing, not just browser will be affected, apt-get also will be affected.

How do you know that you apt-get command encounter proxy issue, when ypu received "401 authenticationrequired" error after running your apt-get command, like below:

$ sudo apt-get update
...
W: Failed to fetch http://my.archive.ubuntu.com/ubuntu/dists/raring-updates/universe/binary-i386/Packages  401  authenticationrequired
...

How to encounter this?

Method 1 (if you have GUI)

1. Simply open your browser, and the proxy will ask for authentication
2. Fill up your authentication.
3. Rerun your apt-get command

Method 2 (if you have GUI)

1. Go to System -> preferences -> Network Proxy
2. Under Proxy Configuration, put in you proxy details
3. Rerun apt-get

Method 3 (without GUI) - temporary proxy session

1. export the http_proxy environment variable using this command:

   $ sudo export http_proxy='http://myusername:mypassword@myproxyaddress:myproxyport'

2. Rerun apt-get

Method 4 (without GUI) - temporary proxy session

1. run the apt-get command with proxy in one line:

   $ sudo bash -c 'http_proxy="http://myusername:mypassword@myproxyaddress:myproxyport/" apt-get update'

Method 5 (without GUI) - permanent proxy setting on .bashrc

1. Put the settings into .bashrc:

   $ echo "http_proxy='http://myusername:mypassword@myproxyaddress:myproxyport'" >> .bashrc

2. Activate the change:

   $ source .bashrc

3. Rerun apt-get

Method 6 (without GUI) - permanent settings on apt.conf ~ need sudo

1. Append your proxy settings to /etc/apt/apt.conf (choose your proxy, either http, https, ftp, or socks:

   $ sudo echo -e 'Acquire::http::proxy "http://myusername:mypassword@myproxyaddress:myproxyport/";\nAcquire::https::proxy "https://myusername:mypassword@myproxyaddress:myproxyport/";\nAcquire::ftp::proxy "ftp://myusername:mypassword@myproxyaddress:myproxyport/";\nAcquire::socks::proxy "socks://myusername:mypassword@myproxyaddress:myproxyport/";' >> /etc/apt/apt.conf

2. Rerun apt

You can refer to here, on how to determine your proxy ip address and port using curl.